The Case of the Walther CP2 Continued

[Ed Hall]

I'm certain I've discovered the problem, but I'm not sure of the fix. It may take a master CP2 technician to repair. After not hearing anything back from Earl's about parts (perhaps they went on vacation for the last half of December), I delved into the workings a bit further and discovered that when you move the Training/Fire mode switch to the Fire position, it travels ever so slightly further than it should and interferes with the striker as it travels forward to open the valve. Prior to this discovery I had increased the velocity adjustment as far as it would go and still only achieved an average of 406 fps. Now with the switch completely removed I have an average near 500 fps. Not only has the velocity increased, but if I toss the first three shots out of the equation (these would be sighters anyway) my Standard Deviation moved to less than 2 fps with an Extreme Spread of only 5.6 fps (subsequent shots fell within this range). None of my other tests were as close.
Now for the fix? I cannot detect (even with a loupe) any wear on any of the parts or frame. Indeed, other than some very tiny scratches, they all look pristine in cut and finish. The actual hold points for the two positions appear to be somewhat less than precise, but exact. It appears from examination that the two points are determined by the spring and ball (detent device) rolling back and forth over the side of the mounting screw. This in turn sets up an opposing force against the edge of the cutout where it rides against the hold screw head (or possibly the washer). It would appear that I can correct the position by possibly reforming the edge of the cutout on the switch piece, but again, everything looks so "new" with no blemishes. It almost looks as if the better approach would be to enlarge the curved cutout space which the striker moves through, but again, that’s a more expensive part. . .
Anyway, thanks to everyone who assisted me in the past, and if there are any more suggestions, please let me know. I will most likely post more here as I progress through the solution.
Take Care,
Ed Hall
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[Len]

I'd buy another or blueprint and fabricate the part...then grind it a bit.
Maybe it's just too long as you seem to have noted.
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